ï»¿ The unit of length convenient on the atomic scale is known as an angstrom and isdenoted by Ã…: 1 Ã… = 10â€“10 m. The size of a hydrogen atom is about 0.5 Ã…. What is thetotal atomic volume in m 3 of a mole of hydrogen atoms ? from Physics Units and Measurement Class 11 Manipur Board

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Class 10 Class 12
The unit of length convenient on the atomic scale is known as an angstrom and is
denoted by Ã…: 1 Ã… = 10â€“10 m. The size of a hydrogen atom is about 0.5 Ã…. What is the
total atomic volume in m 3 of a mole of hydrogen atoms ?

Radius of hydrogen atom, r = 0.5 = 0.5 Ã— 10â€“10 m

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Give four examples of physical quantities.

Examples of Physical quantitie are force, mass, density and power.
821 Views

What is the need of measurement?

To get the complete knowledge of any physical quantity, measurement is needed. Measurement of any physical quantity involves comparison with a certain basic, arbitrarily chosen, internationally accepted reference standard called unit. Knowledge without measurement is incomplete and unsatisfactory.
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What is measurement?

Measurement is the process of attaching a numeric value to an aspect of a natural phenomenon. Measurement is making the quantitative knowledge of a physical quantity.
1289 Views

Define unit.

The quantity used as a standard of measurement is called unit.

Example: Unit of time is second.

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Define physical quantity.

A measurable quantity in terms of which laws of Physics can be expressed is called physical quantity.

The result of a measurement of a physical quantity is expressed by a number accompanied by a unit.

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